What are they? It's obvious what video is, but how do you add one, if you can? If not, maybe TI are adding video support in a later firmware? I can't see the point myself, really...

What's PublishView Text Box for?

To use publishview go to file >new publish... Then you drag "text box" to the page and you tape what you want then file>convert>tinspire
Then open a new file (CTRL N) and you drag your publishview doc from his directory to your new file.
Then you can save and put it to your TI nspire.
Hope I've helped